Furnace.



D. S. JACOBUS.

FURNACE.

APPLICATION FILED DEC. 10, 1913.

Patented Nov. 23, 1915.

4 LI MR F. m h u m w v u m Nu Q n W Mx. m H W H Im m w W m 1% I r r pWITNESSES:

DAVE S. JACOBUS, 0F JERSEY CITY, NEW JERSEY, ASSIGNOJB; T0 BABCOCR &

COX COMP, OF BAYONNE, NEW JERSEY, A CORPOTION OF w l H JERSEY.

FNACJE.

Specification of Letters Patent.

Patented Nor. 23, tmld.

- Application filed December 10, 1913. Serial No. 805,701.

To all whom it may concern:

Be it known that 1, DAVID S'. JAcoBUs, a citizen of the United States,residing at Jersey City, inthe county of Hudson and State of New Jersey,have invented certain new and useful Improvements in- Furnaces, of whichthe following is a-specification.

My invention relates to a furnace construction, the object beingto-provide means for admitting air to the gases after they leave thefurnace, and above the entire volume of the gases andbelow a bafileforming the roof of the furnace, in order to increase the efliciency ofcombustion and to minimize smoke.

Other objectsare to admit the air in regulated amounts, and'to edect athorough mingling of theair and hot gases by the introduction of asystem of brick work near the rear of the furnace roof.

These and other objects of the invention will be understood by referenceto the accoinpanying drawings in which--v Figure 1 is a longitudinalsection of a furmace and boiler for the purpose of illustratingoneembodiment and application of the invention; Fig. 2 a top view, partlyin sec.- tion, of the furnace Fig. 3 a transverse section through theair inlet to the furnace; and Fig. 4 a topview, enlarged, of the airregulating damper.

Similar reference numerals indicate similar parts in the several views.

For the purpose of explaining one application of my invention have shownmy improved furnace .in connection with a boiler of standard designcomprising a bank 1 of inclined generating tubes expanded into front andrear headers 2 and 3, connected by suitable pipes and circulators to atransverse steam'and water drum 4.

The furnaceis constructed with a longitudinal arch 5 extending from thefront wall to a point substantially below the uptake headers 2, and abridgewall; 6 at the rear ofthegrate. Above the inner end of arch 5, andbetween it and the headers 2,

is a transverse arch 7 supported suficiently far above the arch 5 as toprovide an opening 8 for the admission of air toLtlie see ondarycombustion chamber 9, the opening,

into which chamber is through the contracted passage between arch 5 andbridge wall The roof of chamber 9consists of.

a longitudinal baffle 10 supported on the lower row oftubes of bank 1either encircling the tubes, as shown, or leaving the lower part of thetubes bare, and extending from arch 7 and headers 2 to or beyond thearch 11 to direct the hot gases to the downtake end of the-generatingtubes. In the preferred arrangement brick work piers, or other suitablearrangement of brick work, will be used for mingling the air and hotgases. In the construction shown employ a transverse arch 11' supportedbelow the longitudinal bame 10 and forming the rear wall of chamber 9QThe air and gases are deflected downwardly from the roof 10 and arch 11and pass beneath arch 11 into a chamber 12 below the downtake end of thetubes. A longitudinal bafie 13 resting upon one of the intermediatehorizontal rows of tubes and extending from the downtake headers 3; atransverse baf-' fie 14; and a wall or bame 15 direct the gasesforwardly among the lower tubes of the bank, across the uptake end, andthenalong the tubes above baffle 13 to the stack outlet 16. The'airwhich is admitted to the secondary combustion chamber 9 through opening8 enters the space between the outer metal plate 17 and arch 5 throughopenings 18 in said plate, and to regulate the amount of entering air Iprovide a damper 19 having openings corresponding to openings 18, andadapted to be moved between suitable guides 20 to close the openings 18more or less as may be desired.

From. the foregoing description it will be seen that the air is admittedimmediately below the inclined roof 10 in a sheet above the entirevolume of the hot gases after they leave" the furnace chamber 21, andhence does not reduce the furnace temperature. When air is admitteddirectly into a furnace chamber its action, in minimizing smoke, ishandicapped somewhat through the cooling action of the air on thefurnace walls. By the present arrangement, however, the full furnacetemperature is maintained and practically complete combustion effectedby the arrangement of the secondary combustion chamber where thetendency of the air is to fallthrough the hot gases, and thereby producean eddy action, and where the air and gases in passing beneath the arch11 are further mixed all of which results in a most complete secondarycombustion, and the minimizing of smoke.

The roof 10 of the secondary combustion chamber 9 is inclined downwardlyfrom the front of said chamber to the cross arch 11, and in practicesaid roof and arch become incandescent. Introducing the air in themanner described, that is, in a sheet above the entire volume of thegases and below an arch or incandescent baflle, not only efi'ectspractically complete combustion, but has a beneficial effect in slightlycooling arch 11, thus prolonging its life.

What I claim and desire to secure by Letters Patent of the United Statesis 2-.

' 1; A horizontal water tube boiler having a front external furnace anda primary combustion chamber, a horizontally extending baflie in therear of the primary combustion chamber extending along the tubes to forma secondary combustion chamber below the tubes, an exit from the rear ofthe secondary combustion chamber leading to the tubes, bafliing arrangedalong the tubes for directing the gasesthereover, and means foradmitting air above the level of the primary combustion chamber to thesecondary coanbustion chamber.

2.-A horizontal water tube boiler having a front external furnace and aprimary combustlon chamber,

a. horizontally extending baflle in the rear of the primary combustionchamber extending along the tubes to form a secondary combustion chamberbelow the tubes, an exit from the rear ofthe secondary combustionchamber leading to thetubes, baiflin arranged along the tubes fordirecting the gases thereover,means for admitting air above the level ofthe primary combustion chamber to the secondary combustion chamber, andmeans for regulating the volume of the entering air.

3. A horizontal water tube boiler having a front external furnace and aprimary combustion chamber, a horizontally extending bafiie in the rearof the primary combustion chamber extending along the tubes to form asecondary combustion chamber belo v the tubes, an exit from the rear ofthe secondary combustion chamber leading to the tubes, a transverse archbelow the rear portion of the horizontal battle for deflecting the gasesdownward, battling arranged along the tubes for directing the gasesthereover, and means for admitting air above the level of the primarycombustion chamber to the secondary combustion chamber.

4. A horizontal water tube boiler having a front external furnace and aprimary combustion chamber, a horizontally extending bafiie in the rearof the primary combustion chamber extending along the tubes to form asecondary combustion chamber below the tubes, an exit from the rear ofthe secondary combustion chamber leading to the tubes, a transverse archbelow the rear portion of the horizontal bafile for deflecting the gasesdownward, baffling arranged along the tubes for directing the gasesthereover, means for admitting air above the level of the primarycombustion chamber to the secondary combustion chamber, and means forregulating the volume of the entering air.

In testimony whereof I have hereunto signed my name in the presence oftwo subscribing witnesses.

DAVID S. JACOBUS.

Witnesses:

EUGENE P. TERRY, EDITH CAMP.

